The City of Mercer Island has nearly 10,000 single-family residences, multi-family housing units, businesses and schools connected to our sanitary sewer collection system. Sewage, the wastewater generated from bathrooms and kitchens in these structures, runs through more than 500,000 lineal feet of pipe around the Island. It is pumped through 18 sewage pump stations to the King County/Metro southeast and north-end pumping stations and then across Lake Washington for sewage treatment.

What the City Does

Mercer Island Utility crews clean the sanitary sewer collection system regularly with a high-pressure jetting and vacuum process. They use special cameras to inspect the lines for breaks or blockage due to fats, oil and grease (FOG) or tree roots. They routinely test the pumping station auxiliary power systems. And, they perform all work in accordance with strict City, State and Federal rules and regulations.

Click hereto view the most current version of the Sanitary Sewer Standard Details.

Fats Oil Grease, Keep the Drains Clean on Mercer Island

What You Can Do

Help us keep FOG out of Mercer Islandís sanitary sewer system.

Never pour grease or put food waste down the drain or toilet.

Pour leftover cooking oil and grease into a can and put it in the trash.